joining me now, bill nye the science guy and mark morano, the publisher of climate depo.com. welcome to you both. let me start with you, mark, if i may. you are implacably opposed to the concept of man-made climate change. why? >> we followed the evidence. there are quite literally hundreds of factors that influence global temperature, everything from tilt of the earth's axis to ocean cycles to water vapor, methane, so lar system, if you go down, look at the scientific literature, we are finding reams of data and new studies showing the medieval periods are as warm or warmer today without our co2 emissions. we have gone 16 years without global warming according to u.n. data and we have the absurd spectacle of people claiming acts of congress can control the weather and make hurricanes less nasty and tornadoes less frequent which by the way none of them are showing any trends at all that are unusual. >> okay. bill nye, your response? >> well, we start talking about the facts, the medieval warming period and roman warming period, those are just in europe. let's see if we can ag